All exploratory holes no longer necessary for underground mining shall be filled or sealed, maximizing to the extent technologically and economically feasible return of mine and processing waste, tailings, and any other waste incident to the underground mining operation, to the mine workings or excavations.
225 ILCS 720/4.04
Exploratory Holes
P.A. 81-1015.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.